William Perlman/The Star-LedgerGiants running back Brandon Jacobs was fined $20,000 for what the NFL termed "unsportsmanlike conduct toward fans" before Sunday's loss to the Eagles in Philadelphia. Jacobs said he will appeal the fine.

In Week 2, Brandon Jacobs accidentally fired his helmet into the stands. It cost him $10,000.

Last weekend, Jacobs only sent words and gestures toward the Eagles fans. This time, the rate was doubled.

The Giants’ running back was fined $20,000 because of a pregame incident in which he had an exchange with fans at Philadelphia’s Lincoln Financial Field. The NFL termed the violation "unsportsmanlike conduct toward fans."

In an e-mail today, NFC information manager Randall Liu wrote that “Jacobs was observed by an NFL security representative making obscene gestures and yelling obscenities toward fans in the stands.”

Liu said Jacobs, who will start this Sunday's game against the Jaguars, received a letter from NFL executive vice president of football operations Ray Anderson in which Anderson wrote the conduct was "unprofessional and unbecoming as an NFL player" and noted that "repeated violations will result in increased disciplinary action, which may include suspension for conduct detrimental to the league."

Jacobs’ fine was so large because it was his second violation. The first one was when he flung his helmet into the crowd during the loss to the Colts in September.

Asked about the incident today during the open locker room, Jacobs would only say he’s appealing the fine. His agent, Justin Schulman, declined comment except to confirm the fine will be appealed.

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Liu also confirmed Eagles CB Asante Samuelwas fined $40,000 for his hit on WR Derek Hagan and Eagles LG Todd Herremans was fined $5,000 for a "chop block," which was the second penalty on him during the game. There was no mention of the tripping call, which was the more blatant penalty on Herremans and one that fired up Giants DT Chris Canty.